From 6e25cefc46470cbe51c675c6690161dc785767d0 Mon Sep 17 00:00:00 2001
From: Jonathan Young <jonathan.young@digital.cabinet-office.gov.uk>
Date: Tue, 10 Oct 2023 15:19:07 +0100
Subject: [PATCH] Parallelise MiniTest workflow

This configures the MiniTest workflow to run
using a matrix strategy. It run separate parts
of the test suite on different nodes and hence
speeds up total run time of the CI/CD pipeline.
---
 .github/workflows/minitest.yml | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/minitest.yml b/.github/workflows/minitest.yml
index 93d61a0fc9eb..ba1f1624a8b5 100644
--- a/.github/workflows/minitest.yml
+++ b/.github/workflows/minitest.yml
@@ -17,6 +17,14 @@ jobs:
   run-minitest:
     name: Run Minitest
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ci_node_index: [
+          "test/unit/lib test/unit/app/helpers test/unit/app/presenters test/unit/app/validators test/unit/app/workers test/views",
+          "test/unit/app/models test/unit/app/services test/unit/app/uploaders test/unit/*_test.rb",
+          "test/functional test/components test/integration"
+        ]
     steps:
       - name: Setup MySQL
         id: setup-mysql
@@ -65,4 +73,4 @@ jobs:
           RAILS_ENV: test
           GOVUK_CONTENT_SCHEMAS_PATH: vendor/publishing-api/content_schemas
           TEST_DATABASE_URL: ${{ steps.setup-mysql.outputs.db-url }}
-        run: bundle exec rake test
+        run: bundle exec rails test ${{ matrix.ci_node_index }}